The effectiveness of a head-up display (HUD) was investigated as a means of controlling drivers' speeding behavior on a highway, a residential road, and as a means of minimizing the effects of speed adaptation. 40 subjects were randomly assigned to one of four treatment conditions, using either a HUD or a conventional speedometer and being speed-adapted or nonspeed-adapted. Analysis indicated that no group drove significantly faster than any other group on any measured section of residential road or highway under any condition. Plausible explanations for the observed results are discussed.
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